Compressors, Gas Turbines and Jet Engines
The clearance volume of the air compressor is kept minimum because

It results in minimum work
It permits isothermal compression
It allows maximum compression to be achieved
It greatly affects volumetric efficiency

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Compressors, Gas Turbines and Jet Engines
The degree of reaction in an axial flow compressor is defined as the ratio of static enthalpy rise in the

Rotor to static enthalpy rise in the stage
Rotor to static enthalpy rise in the stator
Stator to static enthalpy rise in the rotor
Stator to static enthalpy rise in the stage

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